I decided to add a rear seat cause... well I have a special friend and she has a little hot rodder ... So I grabbed a sliding seat frame from speedway motors and used it as a basis for an adjustable height mount for a child seat.. the box underneath is a subwoofer enclosure just places to mock up clearance.

Onboard air tank and compressor mount in progress. The air tank sits flush on top and the compressor along with solenoid valves and the control electronics will mount to the underside within the space of the frame.

The top surface was literally shaped with the tank in place for the tight fit, clear packing tape made releasing easy and kept the tank clean.

Steering column assembly getting there... made it a tilting column. When I bought parts to build the belt drive for the rear wheel, I got a few sizes of belts for mocking up and finding the best fit. So I decided to use an extra belt to make a vertical drop in the steering system got a little fine tuning but the proof of concept works great